I agree about deciding what you do and do not want. I think a really simple, no-frills system can actually help there. There's just no way to spend much time "procrastiplanning" without realizing it. As for deciding what you really want, I've found that reading something on my todo list over and over again brings the question to the front. There's only so often I will look at an unwant item before I realize it's an unwant item.